کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6480710 1428764 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Suitability of different foamed bitumens for warm mix asphalts with increasing recycling rates
ترجمه فارسی عنوان
مناسب بودن بتمن های مختلف فوم برای آسفالت های آسفالت گرم با افزایش میزان بازیافت
کلمات کلیدی
قیر فوم بازیافت، مخلوط آسفالت، نسبت گسترش، نیمه عمر، منحنی های افتادگی، شاخص فوم، فوم تثبیت کننده افزودنی، حساسیت آب،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


- Different foamed bitumens were studied to be used in warm asphalt mixtures.
- Decay curves of foamed bitumen assessed by a laser device were studied in detail.
- Foam index and suitable foam quality space are key tools for foamed bitumen studies.
- Better foamability was found for soft binders, 3% water content and 0.1% additive.
- Foamed bitumen allows production of durable recycled mixtures at lower temperatures.

Due to the current need for more sustainable production processes and construction materials, foamed bitumen has become one of the most interesting solutions for asphalt paving works, both for new (warm mix) and recycled asphalt mixtures (warm recycled mix). However, significant work still needs to be carried out in order to fully understand the performance of foamed bitumens, and their adequacy for incorporation into asphalt mixtures with different amounts of reclaimed materials, which is the main objective of this work. Three types of bitumen, with increasing penetration grades were selected in order to evaluate their foaming properties, namely their expansion ratio and half-life, as well as the foam index assessed using the foam decay curves obtained through a semi-automated process. After determining the most suitable composition of each foamed bitumen (water content, temperature, foam stabilizing additive content), these were incorporated into asphalt mixtures with 0%, 30% and 50% reclaimed asphalt material. As the amount of reclaimed material increased, the penetration grade of the new bitumen added was also increased, in order to compensate the lost properties of the aged binder. The suitability of these solutions was assessed through water sensitivity tests, and it was concluded that the proposed approach is adequate to obtain long-lasting solutions. Moreover, it became evident that foamed bitumens perform better when incorporated into recycled asphalt mixtures.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 142, 1 July 2017, Pages 342-353
نویسندگان
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